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Cronbach’s alpha for the 4 expectancy scales derived from the Beverage Opinion Questionnaire. The average correlation was found by averaging the Fisher transforms of the 3 correlations and taking the inverse transform of the results.
| Cronbach's alpha (standardized value) | ||||
|---|---|---|---|---|
| Cognitive improvement (3 items) | Negative Affect Arousal (3 items) | Social enhancement /Relaxation (7 items) | Average | |
| Age 6–8 | .66 | .57 | .68 | .64 |
| Age 9–11 | .84 | .64 | .70 | .74 |
| Age 12–14 | .79 | .64 | .83 | .76 |
| Age 15–17 | .87 | .67 | .88 | .82 |
